Who has the least children in the world?

It's difficult to identify a specific individual or group as having the least children in the world, as many people choose not to have children for various personal, economic, or social reasons. However, certain populations or Demographics, such as individuals in urban areas or those pursuing extensive education and careers, often have fewer children. Additionally, some cultures or societies may have norms or practices that lead to smaller family sizes. In extreme cases, individuals without children at all could be considered to have the least.